<?php
namespace application\common\model;
/**
 * 基于thinkphp里面的分页类进行修改，添加了页码省略号、自定义连接类
 * 适用于赛事无忧分页样式
 */
class Page {
    public $firstRow; // 起始行数
    public $listRows; // 列表每页显示行数
    public $parameter; // 分页跳转时要带的参数
    public $totalRows; // 总行数
    public $totalPages; // 分页总页面数
    public $rollPage   = 11;// 分页栏每页显示的页数
	public $lastSuffix = true; // 最后一页是否显示总页数

    private $p       = 'page'; //分页参数名&page=1
    private $url     = ''; //当前链接URL
    private $nowPage = 1;

	// 分页显示定制
    private $config  = array(
        'header' => '<span class="rows">共 %TOTAL_ROW% 条记录</span>',  //分页头部第一栏显示样式（共 3 条记录）
        'prev'   => '上一页',
        'next'   => '下一页',
        'first'  => '1...',
        'last'   => '...%TOTAL_PAGE%',
        'theme'  => '%FIRST% %UP_PAGE% %LINK_PAGE% %DOWN_PAGE% %END% %PAGE_JUMP%',
        'currentClass'  => 'current',    //当前活动页class
        'hrefClass'     => 'num', //分布链接标签自定义类
        'omitShowNum'   => 2, //带省略号的省略页数
        'leftOmit'      => '...',    //页码左边省略
        'rightOmit'     => '...',   //页码右边省略
    );

    /**
     * 架构函数
     * @param array $totalRows  总的记录数
     * @param array $listRows  每页显示记录数
     * @param array $parameter  分页跳转的参数|类变量的设置
     */
    public function __construct($totalRows, $listRows=20, $parameter = array()) {
        config('VAR_PAGE') && $this->p = config('VAR_PAGE'); //设置分页参数名称
        /* 基础设置 */
        $this->totalRows  = $totalRows; //设置总记录数
        $this->listRows   = $listRows;  //设置每页显示行数
        foreach ($parameter as $key=>$value){   //类变量初始化
            $this->setValue($key, $value);
        }
        $this->parameter  = empty($parameter) ? $_GET : $parameter;
        $this->nowPage    = empty($_GET[$this->p]) ? 1 : intval($_GET[$this->p]);
        $this->nowPage    = $this->nowPage>0 ? $this->nowPage : 1;  //当前活动页
        $this->firstRow   = $this->listRows * ($this->nowPage - 1); 
    }

    /**
     * 定制分页链接设置
     * @param string $name  设置名称
     * @param string $value 设置值
     */
    public function setConfig($name,$value) {
        if(isset($this->config[$name])) {
            $this->config[$name] = $value;
        }
    }
    /**
     * 设置类公用变量值
     * @param string $name  设置名称
     * @param string $value 设置值
     */
    public function setValue($name, $value)
    {
        if (isset($this->$name)){
            $this->$name = $value;
        }
        return $this;
    }
    /**
     * 生成链接URL
     * @param  integer $page 页码
     * @return string
     */
    private function url($page){
        return str_replace(urlencode('[PAGE]'), $page, $this->url);
    }

    /**
     * 组装分页链接
     * @param 是否自定义url
     * @return string
     */
    public function show($diyUrl = false) {
        if(0 == $this->totalRows) return '';
        /* 生成URL */
        $this->parameter[$this->p] = '[PAGE]';
        if($diyUrl) {
            $this->url .= $this->p . '/' .urlencode('[PAGE]');
        } else {
            $this->url = url(\think\Request::instance()->action(), $this->parameter);
        }
        /* 计算分页信息 */
        $this->totalPages = ceil($this->totalRows / $this->listRows); //总页数
        if(!empty($this->totalPages) && $this->nowPage > $this->totalPages) {
            $this->nowPage = $this->totalPages;
        }

        /* 计算分页临时变量 */
        $now_cool_page      = $this->rollPage/2;
		$now_cool_page_ceil = ceil($now_cool_page);
		$this->lastSuffix && $this->config['last'] = $this->totalPages;

        //上一页
        $up_row  = $this->nowPage - 1;
        $up_page = $up_row > 0 ? '<li><a class="prev" href="' . $this->url($up_row) . '">' . $this->config['prev'] . '</a></li>' : '';

        //下一页
        $down_row  = $this->nowPage + 1;
        $down_page = ($down_row <= $this->totalPages) ? '<li><a class="next" href="' . $this->url($down_row) . '">' . $this->config['next'] . '</a></li>' : '';

        //第一页
        $the_first = '';
        if($this->totalPages > $this->rollPage && ($this->nowPage - $now_cool_page) >= 1){
            $the_first = '<li><a class="first" href="' . $this->url(1) . '">' . $this->config['first'] . '</a></li>';
        }

        //最后一页
        $the_end = '';
        if($this->totalPages > $this->rollPage && ($this->nowPage + $now_cool_page) < $this->totalPages){
            $the_end = '<li><a class="end" href="' . $this->url($this->totalPages) . '">' . $this->config['last'] . '</a></li>';
        }
        //自定页数跳转
        $page_jump = '';
        if ($this->totalPages > 10){
            $page_jump_str = '<li class="searchPage">
                              <span class="page-sum">共<strong class="allPage">%d</strong>页</span>
                              <span class="page-go">跳转<input style="width:41px;height:20px;padding-left:2px;border: 1px solid #c4c4c4;" type="text" id="go_page">页</span>
                              <a href="javascript:window.location.href=\'%s\'+document.getElementById(\'go_page\').value;" class="page-btn">GO</a>
                            </li>';
            $page_jump = sprintf($page_jump_str, $this->totalPages, str_replace('[PAGE]', '', urldecode($this->url)));
        }
        //数字连接
        $link_page = "";
        for($i = 1; $i <= $this->rollPage; $i++){
			if(($this->nowPage - $now_cool_page) <= 0 ){
				$page = $i;
			}elseif(($this->nowPage + $now_cool_page - 1) >= $this->totalPages){
				$page = $this->totalPages - $this->rollPage + $i;
			}else{
				$page = $this->nowPage - $now_cool_page_ceil + $i;
			}
			
            if($page > 0 && $page != $this->nowPage ){
                
                //省略号的判断start
                if( ($page <= $this->totalPages) && ($this->nowPage - $page) > $this->config['omitShowNum'] &&  $page !=1 ){   
                    if(isset($leftOmit))continue;
                    $link_page .= '<li><a class="'.$this->config['hrefClass'].'" href="' . $this->url(($this->nowPage - $page-1)) . '">'.$this->config['leftOmit'].'</a></li>';
                    $leftOmit = true;
                    continue;
                } elseif( ($page <= $this->totalPages) && ($page - $this->nowPage) > $this->config['omitShowNum'] &&  $page !=$this->totalPages ){
                    if(isset($rightOmit))continue;
                    $link_page .= '<li><a class="'.$this->config['hrefClass'].'" href="' . $this->url($page) . '">'.$this->config['rightOmit'].'</a></li>';
                    $rightOmit = true;
                    continue;
                }elseif($page <= $this->totalPages){
                    $link_page .= '<li><a class="'.$this->config['hrefClass'].'" href="' . $this->url($page) . '">' . $page . '</a></li>';
                }else{
                    break;
                }
            }else{  //当前页
                if($page > 0 && $this->totalPages != 1){
                    $link_page .= '<li><a class="'.$this->config['currentClass'].' '.$this->config['hrefClass'].'">' . $page . '</a></li>';
                }
            }
        }

        //替换分页内容
        $page_str = str_replace(
            array('%HEADER%', '%NOW_PAGE%', '%UP_PAGE%', '%DOWN_PAGE%', '%FIRST%', '%LINK_PAGE%', '%END%', '%TOTAL_ROW%', '%TOTAL_PAGE%', '%PAGE_JUMP%'),
            array($this->config['header'], $this->nowPage, $up_page, $down_page, $the_first, $link_page, $the_end, $this->totalRows, $this->totalPages, $page_jump),
            $this->config['theme']);
        return "{$page_str}";
    }
}
